code: def test_dfs(self, setup, kg, root, max_depth, max_walks, is_reverse):
      root = f"{URL}#{root}"
      for walk in RandomWalker(
          max_depth, max_walks, random_state=42
      )._dfs(kg, Vertex(root), is_reverse):
          assert len(walk) <= (max_depth * 2) + 1
          if is_reverse:
              assert walk[-1].name == root
          else:
              assert walk[0].name == root
  
file_path: pyRDF2Vec/tests/walkers/test_random.py
imports: import itertools
  import pytest
  from pyrdf2vec.graphs import KG, Vertex
  from pyrdf2vec.walkers import RandomWalker
label_desc: Use image node_id 3 for calling the TestRandomWalker obj's underlying member method code with example usage: obj.test_dfs(setup, kg, root, max_depth, max_walks, is_reverse) without return types